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【翻译题目】
46) This movement，driven by powerful and diverse motivations, built a nation out of a wilderness and, by its nature, shaped the character and destiny of an uncharted continent.
47)The United States is the product of two principal forces-the immigration of European people with their varied ideas, customs, and national characteristics and the impact of a new country which modified these traits.
48)But the force of geographic conditions peculiar to America, the interplay of the varied national groups upon one another, and the sheer difficulty of maintaining old-world ways in a raw, new continent caused significant changes.
49)The first shiploads of immigrants bound for the territory which is now the United States crossed the Atlantic more than a hundred years after the 15th- and -16th-century explorations of North American.
50)The virgin forest with its richness and variety of trees was a real treasure-house which extended from Maine all the way down to Georgia.
【题目解析】
46)本句重点词语：driven by 在…的驱动下，by its nature 从本质上，它的性质，
shape做动词当"塑造"讲。本句是一个由and连接的并列句，其中driven by powerful and diverse motivations,和by its nature为插入语结构。
47)本句重点词语：principle做形容词，意为"主要的"， national characteristics 意为"民族特色，特点"，modify意为"修改，改变"。多次考察了of和with引导的后置定语的翻译，前三小句为并列结构表原因，第四小句为句子主干。
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